package org.apache.solr.util;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

public class DefaultSolrThreadFactory implements ThreadFactory {

    private static final AtomicInteger poolNumber = new AtomicInteger(1);
    private final ThreadGroup group;
    private final AtomicInteger threadNumber = new AtomicInteger(1);
    private final String prefix;

    public DefaultSolrThreadFactory(String namePrefix) {

        SecurityManager s = System.getSecurityManager();
        group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
        prefix = namePrefix + "-" + poolNumber.getAndIncrement() + "-thread-";
    }

    @Override
    public Thread newThread(Runnable r) {

        Thread t = new Thread(group, r, prefix + threadNumber.getAndIncrement(), 0);

        t.setDaemon(false);

        if (t.getPriority() != Thread.NORM_PRIORITY) {
            t.setPriority(Thread.NORM_PRIORITY);
        }

        return t;
    }
}